Saturday, 13 August 2011

European efficiency labels for electric motors (tech, a bit heavy :( )

New European-wide regulations took effect in June, affecting manufacturers of low-voltage (LV) induction electric motors. The Regulation (EC) N° 640/2009 states that only efficiency Class IE2 or IE3 motors can be placed on the market in the European Economic Area after June 16, 2011.
As of this writing, a number of interpretation issues were subject of intense debate within the UK and Europe. REMA (Rotating Electrical Machines Association), the UK trade association for motor manufacturers, is updating developments through a related organization, BEAMA, the Federation of British Electrotechnical and Allied Manufacturers’ Associations.

The legislation is applicable for 2, 4, and 6-pole 50Hz and 60Hz motors in the power range between 0.75 and 375kW. The International Efficiency (IE) rating defines how efficiently the motor operates, replacing the previously used EFF 1 and EFF2 designations.

The measuring method for the IE rating is an important differentiating criterion from what has been used in the past, Siemens Drives Technologies Division told CEE. Previously, the stray load losses were taken into account with a fixed 0.5%; these are now precisely calculated. Siemens has used examples of its own motors to indicate what this will mean in practice: A 4-pole 5.5 kW motor for 50 Hz, which previously had an efficiency of 89.2%, now has an efficiency of 88.2% according to the new efficiency calculation method in compliance with IEC 60034-2-1:2007. For the 60Hz type, the efficiency is 89.5%. This change in the efficiency—with the motor technology remaining the same—will be applicable for all motor manufacturers as a result of the modified measuring method.

tap on the shoulder, you can wake up now

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